javascript 瀑布流

现在图片网与商城流行一种叫“瀑布流”的布局，我们公司也不小心得了“流行性感冒”，要搞这个。于是我就写了一个，现在再用我的框架mass重写一下，发布出来，顺便宣传一下我的框架。

瀑布流其实没什么东西，就是列布局与无限拖的结合。由于要支持IE6就没有CSS3，直接对列进行绝对定位。列就是一个DIV。然后就是列中每个板块的添加问题，我管它为砖头。每添加一块砖头前，比较一下哪列最短，就往哪里塞。最后就是无限拖，太easy了。加之，我的框架对样式，事件等设置非常简单，比jQuery更方便。

下面就是源码，用到了并行加载技术，预设时加载了random,ready,css,event这几个模块，它们就会自行加载其依赖模块了。

$.require("more/random,ready,css,event",function(random){ 
    //容器的CSS表达式，列数，每列的宽度 
    var Waterfall = function(expr, col, colWidth){ 
        //构建整体轮廓 
        var container = this.container = $(expr); 
        var pw = container.width();//容器的宽 
        var gw = (pw - col * colWidth)/(col-1);//列间距离 
        this.colWidth = colWidth; 
        this.cols = []; 
        for(var i = 0; i < col ; i++){//随机生成列 
            this.cols[i] = $("<div class='waterfall' />").css({ 
                position: "absolute", 
                top: 0, 
                left: (colWidth + gw) * i, 
                width: colWidth, 
                backgroundColor: random.hex() 
            }).appendTo(container); 
        } 
    } 
    Waterfall.prototype = { 
        //添加板块 
        addBlocks : function(){ 
            for(var i = 0; i < 40; i++){//随机生成40个板砖 
                $("<div class='waterfall_block' />").css({ 
                    margin: 5, 
                    width: this.colWidth - 10 , 
                    height: random.num(80, 300), 
                    backgroundColor: random.hex() 
                }).appendTo( this.whichCol() ); 
            } 
        }, 
        //计算出最短的栏栅 
        whichCol:function(el, ret, h){ 
            for(var i = 0, shortest = 0; el = this.cols[i]; i++){ 
                h = el.height(); 
                if(i == 0){ 
                    shortest = h; 
                    ret = el; 
                } 
                if(h < shortest ){ 
                    shortest = h; 
                    ret = el; 
                } 
            } 
            return ret; 
        } 
    }; 
 
    var waterfall = new  Waterfall("body",4,300) 
    waterfall.addBlocks(); 
    $(window).scroll(function(){ 
        var clientHeight = $(window).height(), 
        scrollTop = $(window).scrollTop(), 
        scrollHeight = $(document).height(); 
        if(clientHeight + scrollTop >=  scrollHeight ){ 
            waterfall.addBlocks(); 
        } 
    }) 
})

源码放于github中。

IE下如果报错，请它刷新页面

<!doctype html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
        <title>瀑布流</title>
        <script src="https://raw.github.com/RubyLouvre/mass-Framework/master/src/mass.js"></script>
        <script>
            window.onerror = function(){
               location.reload();//如果报错，请它自动刷新。
            }
            $.require("more/random,ready,css,event",function(random){
                //容器的CSS表达式，列数，每列的宽度
                var Waterfall = function(expr, col, colWidth){
                    //构建整体轮廓
                    var container = this.container = $(expr);
                    var pw = container.width();//容器的宽
                    var gw = (pw - col * colWidth)/(col-1);//列间距离
                    this.colWidth = colWidth;
                    this.cols = [];
                    for(var i = 0; i < col ; i++){//随机生成列
                        this.cols[i] = $("<div class='waterfall' />").css({
                            position: "absolute",
                            top: 0,
                            left: (colWidth + gw) * i,
                            width: colWidth,
                            backgroundColor: random.hex()
                        }).appendTo(container);
                    }
                }
                Waterfall.prototype = {
                    //添加板块
                    addBlocks : function(){
                        for(var i = 0; i < 40; i++){//随机生成40个板砖
                            $("<div class='waterfall_block' />").css({
                                margin: 5,
                                width: this.colWidth - 10 ,
                                height: random.num(80, 300),
                                backgroundColor: random.hex()
                            }).appendTo( this.whichCol() );
                        }
                    },
                    //计算出最短的栏栅
                    whichCol:function(el, ret, h){
                        for(var i = 0, shortest = 0; el = this.cols[i]; i++){
                            h = el.height();
                            if(i == 0){
                                shortest = h;
                                ret = el;
                            }
                            if(h < shortest ){
                                shortest = h;
                                ret = el;
                            }
                        }
                        return ret;
                    }
                };

var waterfall = new Waterfall("body",4,300)
                waterfall.addBlocks();
                $(window).scroll(function(){
                    var clientHeight = $(window).height(),
                    scrollTop = $(window).scrollTop(),
                    scrollHeight = $(document).height();
                    if(clientHeight + scrollTop >=  scrollHeight ){
                        waterfall.addBlocks();
                    }
                })
            })
        </script>
    </head>
    <body>
        <p>
            瀑布流 by 司徒正美
        </p>
    </body>
</html>

最后附上微博上对它的评论：Pinterest创造的瀑布流样式，有几个预设前提：1、图片极重要，文字不重要；2、用户浏览无明确目的，对复杂的索引无依赖性；3、图片整体美观度较高。因此恰恰适合Pinterest这样的“好图挖掘与收藏网站”。最近几个月国内跟风瀑布流，也太盲目了些。

posted @ 2012-06-29 10:36 猫200 阅读(296) 评论(1) 编辑收藏举报

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